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https://www.opelgt.com/threads/list-of-best-engine…
List of best engine swaps? - Opel GT Forum
1971 Opel GT - full rotisserie restoration - painted modern corvette yellow - Orig1.9L > 2L short block, 45 & 36mm valves, ported head, Isky OR-66 hyd cam, heavily ported 73 intake welded & tented , Weber 38 dges, pertronix ignition , and flame thrower coil, aluminum flywheel with S-10 clutch, 4 speed trans .